PURPOSE: To form properly an image of light spot on an information track while absorbing wave motion due to resonance/buckling by adhering a damper member on an outer circumferential face of a spiral plate spring made of an elastic member so as to constitute the damper member and providing fixedly the outer circumference of the spiral plate spring and the outer circumference of the damper member to an outer frame incorporatedly.

CONSTITUTION: The damper member 22 is constituted incorporatedly to an outer circumference side of spiral springs 9, 10 while adhering the member 22 by an adhesives or the like. Further, the outer circumference of the spiral springs 9, 10 is mounted to the outer frame 1 while being clipped respectively with the damper member 22 and spacers 11, 12. Through the constitution above, in giving a focusing signal to a coil 8, the objective lens 16 is displaced in the direction of optical axis by the drive of the spiral springs 9, 10 made of an elastic member. The wave motion due to buckling caused with respect to the tracking drive and the focusing drive or the wave motion due to resonance caused at the focusing is absorbed completely by the damper member 22 and the outer frame 1.